CN101713674B - Flow rate measuring system - Google Patents

Flow rate measuring system Download PDF

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Publication number
CN101713674B
CN101713674B CN2009101745311A CN200910174531A CN101713674B CN 101713674 B CN101713674 B CN 101713674B CN 2009101745311 A CN2009101745311 A CN 2009101745311A CN 200910174531 A CN200910174531 A CN 200910174531A CN 101713674 B CN101713674 B CN 101713674B
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electromagnetic flowmeter
signal
subordinate
synchronizing signal
master sync
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CN101713674A (en
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铃木伸
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Azbil Corp
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Azbil Corp
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01FMEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/56Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
    • G01F1/58Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
    • G01F1/60Circuits therefor

Abstract

To enable continued flow speed measurement in a slave electromagnetic flow meter even if the synchronization signal from the master electromagnetic flow meter is stopped by a communication fault, or the like. In a slave electromagnetic flow meter (6-2), the synchronization signal from a master electromagnetic flow meter (6-1) (that is, a master electromagnetic signal) (MPs) is monitored, and if the master synchronization signal (MPs) ceases to be received, then the synchronization signal used for the flow rate measurement is switched to a synchronization signal (Ps) that is generated by the synchronization signal generating unit (52) of the slave electromagnetic flow meter (6-2), and the switched synchronization signal (Ps) is defined as the master synchronization signal (MPs') for the slave electromagnetic flow meter (6-3) in the next stage.

Description

Flow Measuring System
Technical field
The present invention relates to be suitable for Flow Measuring System to the filling machine of fluids such as a plurality of vessel filling beverages or pharmaceuticals.
Background technology
In the past, as this Flow Measuring System, people used such system, the system that promptly utilizes electromagnetic flowmeter that the fluid injection rate IR of each container of injection fluid is kept watch on.
In this system, need be to a plurality of containers fill fluid continuously, therefore closely dispose each other and be used for injecting each ascending pipe of fluid and being arranged at each electromagnetic flowmeter of each ascending pipe to container.Particularly under the situation of small containers, the closeness of each ascending pipe increases.
In this system, each electromagnetic flowmeter is measured the flow that flows through the fluid in each ascending pipe according to applying the electromotive force (electromotive force that between signal electrode, produces) that alternating magnetic field produces through the fluid in each ascending pipe.At this moment, if the closeness of each ascending pipe increases then when the switching of square wave excitation incremental noise that the switching of the alternating magnetic field (time) produce as the adjacent electromagnetic flowmeter that can interact of the leakage field from field coil.
In electromagnetic flowmeter, confirm excitation time based on individual other clock signal.Therefore, excitation frequency has produced small deviation in each electromagnetic flowmeter.In this case, even the excitation time originally in each electromagnetic flowmeter is consistent, excitation time also can produce deviation along with the past of time.So, if between the sampling period of the electromotive force that produces between the signal electrode, carry out the switching of square wave excitation by the electromagnetic flowmeter of adjacency, comprised error the measured value of the flow that then obtains from this electromotive force.Promptly, in exchanging flow velocity signal, produce spiking, can sample this spiking by the influence of the incremental noise of adjacent electromagnetic flowmeter.Therefore, the loading of fluid changes between a plurality of containers, makes the reproducibility deteriorates relevant with loading.
Therefore; In patent documentation 1; In the electromagnetic flowmeter that will be provided with according to each ascending pipe any as main electromagnetic flowmeter, other electromagnetic flowmeter as the subordinate electromagnetic flowmeter; With being connected in series between main electromagnetic flowmeter and the subordinate electromagnetic flowmeter, the synchronizing signal that in main electromagnetic flowmeter, generates is sent to all subordinate electromagnetic flowmeters as master sync signal through synchronous signal line.
In the system shown in this patent documentation 1, main electromagnetic flowmeter produces magnetic field and carries out flow measurement in the excitation time of the synchronized that the synchronizing signal generation portion with oneself generates.The subordinate electromagnetic flowmeter with the synchronous excitation time of the synchronizing signal of sending directly or indirectly (master sync signal) from main electromagnetic flowmeter, produce magnetic field and carry out flow measurement.Thus, all electromagnetic flowmeter produces magnetic field and carries out flow measurement in identical excitation time.
Patent documentation 1: TOHKEMY 2001-348092 communique
But; In the system shown in the patent documentation 1; Main electromagnetic flowmeter break down or main electromagnetic flowmeter and subordinate electromagnetic flowmeter between synchronous signal line break or the subordinate electromagnetic flowmeter between synchronous signal line break or the receiving circuit of the synchronizing signal of subordinate electromagnetic flowmeter breaks down or takes place on the synchronous signal line overlappingly under the situation of exceptional communication such as noise, can have the subordinate electromagnetic flowmeter of the master sync signal that can't receive autonomous electromagnetic flowmeter.At this moment, in can't receiving the subordinate electromagnetic flowmeter of master sync signal, can not carry out flow measurement, be interrupted to the operation of vessel filling fluid from the ascending pipe that is provided with this subordinate electromagnetic flowmeter, throughput rate is low.
Summary of the invention
Such problem is made even the present invention is in order to solve, purpose is to provide a kind of because of communication abnormality etc. causes coming the synchronizing signal (master sync signal) of autonomous electromagnetic flowmeter to be cut off, and also can in the subordinate electromagnetic flowmeter, proceed the Flow Measuring System of flow measurement.
In order to reach such purpose the present invention is a plurality of electromagnetic flowmeters that possess the synchronizing signal generation unit that comprises the synchronizing signal that produces assigned frequency; With any of a plurality of electromagnetic flowmeters as main electromagnetic flowmeter; With other electromagnetic flowmeter as the subordinate electromagnetic flowmeter; The synchronizing signal that in main electromagnetic flowmeter, oneself synchronizing signal generation unit is produced as master sync signal and with the synchronous excitation time of this master sync signal in; Produce magnetic field and carry out flow measurement, the subordinate electromagnetic flowmeter, with the synchronous excitation time of the master sync signal that sends directly or indirectly from main electromagnetic flowmeter in; Produce the Flow Measuring System that flow measurement is carried out in magnetic field; In the subordinate electromagnetic flowmeter, be provided with the synchronizing signal monitor unit, it keeps watch on the master sync signal of autonomous electromagnetic flowmeter, under the situation of the master sync signal that does not receive autonomous electromagnetic flowmeter; The synchronizing signal that will be used for flow measurement switches to the synchronizing signal that oneself synchronizing signal generation unit generates, and the conduct of the synchronizing signal after will the switching master sync signal of the subordinate electromagnetic flowmeter transmission of one-level backward.
According to the present invention, for example, a plurality of electromagnetic flowmeters are being set under the situation of first, second and third such three electromagnetic flowmeters, with any is as main electromagnetic flowmeter in these three electromagnetic flowmeters, remaining two as the subordinate electromagnetic flowmeter.For example, if with first electromagnetic flowmeter as main electromagnetic flowmeter, then with second, third electromagnetic flowmeter as first and second subordinate electromagnetic flowmeter.The synchronizing signal that main electromagnetic flowmeter generates oneself synchronizing signal generation unit is as master sync signal, carrying out flow measurement producing magnetic field with the synchronous excitation time of this master sync signal.
And; Master sync signal coming autonomous electromagnetic flowmeter is directly sent to the first subordinate electromagnetic flowmeter; Sent to indirectly via the first subordinate electromagnetic flowmeter under the situation of the second subordinate electromagnetic flowmeter; The first subordinate electromagnetic flowmeter produces magnetic field and carries out flow measurement through having carried out synchronous excitation time with the master sync signal that directly sends from main electromagnetic flowmeter, the second subordinate electromagnetic flowmeter through with send master sync signal from main electromagnetic flowmeter indirectly and carried out synchronous excitation time and produce magnetic field and carry out flow measurement.
At this; For example; If communication abnormality etc. takes place; In the first subordinate electromagnetic flowmeter, do not receive the master sync signal that comes autonomous electromagnetic flowmeter, then the first subordinate electromagnetic flowmeter synchronizing signal that will be used for flow measurement switches to the synchronizing signal that own synchronizing signal generation unit generates, and the conduct of the synchronizing signal after will switching is to the master sync signal of second subordinate electromagnetic flowmeter transmission.Thus, the first subordinate electromagnetic flowmeter uses the synchronizing signal of the synchronizing signal generation unit generation of oneself to proceed flow measurement.And the second subordinate electromagnetic flowmeter receives the synchronizing signal of the synchronizing signal generation unit generation of the first subordinate electromagnetic flowmeter as master sync signal, use this master sync signal to proceed flow measurement.
In the present invention; The synchronizing signal monitor unit is set in the subordinate electromagnetic flowmeter; But also can the synchronizing signal monitor unit that be arranged at this subordinate electromagnetic flowmeter be arranged in the main electromagnetic flowmeter, make main electromagnetic flowmeter count identical formation with the subordinate Electromagnetic Flow.Promptly, also can make all Electromagnetic Flows that use among the present invention count identical formation.At this moment, the selection setup unit is set in each electromagnetic flowmeter, it is used to make each electromagnetic flowmeter to play a role as main electromagnetic flowmeter or plays a role as the subordinate electromagnetic flowmeter.Thus, the electromagnetic flowmeter that uses has in the present invention become a kind of.And which electromagnetic flowmeter can be set at main electromagnetic flowmeter, can increase main electromagnetic flowmeter as required.
And; In the present invention; The master sync signal of keeping watch on autonomous electromagnetic flowmeter also can be set in the synchronizing signal monitor unit; Under the situation that receives the master sync signal that comes autonomous electromagnetic flowmeter once more, the synchronizing signal that will be used for flow measurement switches to the master sync signal that this receives once more, and the conduct of the master sync signal after will the switching function of the master sync signal of the subordinate electromagnetic flowmeter transmission of one-level backward.Thus; The subordinate electromagnetic flowmeter that does not receive the master sync signal that comes autonomous electromagnetic flowmeter has played the effect of main electromagnetic flowmeter to the subordinate electromagnetic flowmeter of back one-level, automatically returns to original subordinate electromagnetic flowmeter at the time point of the master sync signal that receives autonomous electromagnetic flowmeter once more.
And; In the present invention; Also current pattern notification unit can be set in each electromagnetic flowmeter; Pattern that its synchronizing signal that will use the synchronizing signal generation unit of oneself to produce is carried out flow measurement is defined as holotype, the pattern of using the master sync signal that sends from the electromagnetic flowmeter of previous stage to carry out flow measurement is defined as the subordinate pattern, and current any one pattern is notified to epigyny device.Based on this; In epigyny device; For example the number of the current electromagnetic flowmeter that the is in holotype number with the main electromagnetic flowmeter of being confirmed by initial setting is compared; Duo than the number of the main electromagnetic flowmeter of confirming by initial setting if be in the number of the current electromagnetic flowmeter of holotype, then can discern communication abnormality has taken place, carrying out the action corresponding with it.
And, in the present invention, the master sync signal of keeping watch on autonomous electromagnetic flowmeter can be set in the synchronizing signal monitor unit also, under the situation of the master sync signal that does not receive autonomous electromagnetic flowmeter, this intention notice is given the function of epigyny device.Thus, in epigyny device, for example can grasp the master sync signal which subordinate electromagnetic flowmeter can not receive autonomous electromagnetic flowmeter, can dwindle the position of unusual generation, can promptly carry out the abnormal restoring operation.
According to the present invention; In the subordinate electromagnetic flowmeter, be provided with the master sync signal of keeping watch on autonomous electromagnetic flowmeter; Under the situation of the master sync signal that does not receive autonomous electromagnetic flowmeter; The synchronizing signal that will be used for flow measurement switches to the synchronizing signal of the synchronizing signal generation unit generation of oneself; And the conduct of the synchronizing signal after will switching is the synchronizing signal monitor unit of the master sync signal of the subordinate electromagnetic flowmeter transmission of one-level backward, even therefore come the master sync signal of autonomous electromagnetic flowmeter to be cut off, in the subordinate electromagnetic flowmeter, also can proceed flow measurement.
Based on this; For example; In filling machine; Even taken place that main electromagnetic flowmeter breaks down or main electromagnetic flowmeter and subordinate electromagnetic flowmeter between synchronous signal line and the synchronous signal line between the subordinate electromagnetic flowmeter breaks or the receiving circuit of the synchronizing signal of subordinate electromagnetic flowmeter breaks down or synchronous signal line on overlapping under the situation of exceptional communication such as noise; Can in the subordinate electromagnetic flowmeter, proceed flow measurement, can not interrupt to prevent the decline of throughput rate from the filling operation of ascending pipe to the fluid of container.
Description of drawings
Fig. 1 is the figure of an example constituting of the integral body of the expression filling machine that uses the Flow Measuring System that the present invention relates to.
Fig. 2 is the block diagram of the interior major part of the electromagnetic flowmeter of this filling machine use of expression.
Fig. 3 is the figure of expression as the unidirectional series system (embodiment 1) of an example of the connected mode of passing through synchronous signal line between the electromagnetic flowmeter in this filling machine.
Fig. 4 is the sequential chart of signal of each one of the main electromagnetic flowmeter of expression in this unidirectional series system.
Fig. 5 is the sequential chart that the main Electromagnetic Flow of expression in this unidirectional series system taken into account in the subordinate electromagnetic flowmeter phase relation of field voltage separately.
Fig. 6 is the figure of the action of explanation when on the main electromagnetic flowmeter of this unidirectional series system and the synchronous signal line between the subordinate electromagnetic flowmeter, exceptional communication having taken place.
Fig. 7 is the figure of the action when exceptional communication has been recovered in main electromagnetic flowmeter and the synchronous signal line between the subordinate electromagnetic flowmeter of this unidirectional series system of explanation.
Fig. 8 is the synoptic diagram that is illustrated in the connection example that also is provided with more Electromagnetic Flow timing in the unidirectional series system.
The synoptic diagram of the connection example that Fig. 9 is expression when the connected mode through synchronous signal line is made as tree-shaped mode between electromagnetic flowmeter.
Figure 10 is the figure of the concrete connection status between the processing flowmeter when roughly representing as tree-shaped mode.
The reference numeral explanation:
1 (1-1~1-n)-container; 2 (2-1~2-n)-ascending pipe; 3 (3-1~3-n)-valve; 4 (4-1~4-n)-detecting device; 5 (5-1~5-n)-transducer; 6 (6-1~6-n)-electromagnetic flowmeter; 7 (7-1~7-n)-synchronous signal line; 8 (8-1~8-n)-control part; 4a, 4b-field coil; 4c, 4d-electrode; The 4e-ground loop; 51-clock signal generation portion; 52-synchronizing signal generation portion; The 53-excitation division; 54-controlling of sampling portion; The 55-enlarging section; The 56-maintaining part of sampling; 57-A/D transducer 57; The 58-arithmetic processing section; The 59-efferent; The 60-synchronizing signal receives supervision portion; SW1~SW4-change-over switch.
Embodiment
Below, with reference to accompanying drawing the present invention is elaborated.Fig. 1 is the figure that the example that the integral body of the filling machine of the Flow Measuring System that the present invention relates to constitutes has been used in expression.
A plurality of ascending pipe 2-1~2-n have been arranged side by side in this filling machine.Each ascending pipe 2-1~2-n injects the fluid that beverage or pharmaceuticals etc. have electric conductivity to a plurality of container 1-1~1-n respectively.Each ascending pipe 2-1~2-n is respectively arranged with valve 3-1~3-n.Each valve 3-1~3-n according to after the switching signal stated open and close ascending pipe 2-1~2-n respectively, thereby the control fluid is to the injection of each container 1-1~1-n.
And each ascending pipe 2-1~2-n is respectively arranged with electromagnetic flowmeter 6-1~6-n.Electromagnetic flowmeter 6-1~6-n of each ascending pipe 2-1~2-n is made up of detecting device 4-1~4-n and transducer 5-1~5-n respectively.Each ascending pipe 2-1~2-n is approaching each other, and the detecting device 4-1~4-n that therefore is installed on each ascending pipe 2-1~2-n is also near each other each other.Each transducer 5-1~5-n is connected in series through synchronous signal line 7.
Detecting device 4-1~4-n applies alternating magnetic field to the fluid in ascending pipe 2-1~2-n respectively, will output to transducer 5-1~5-n based on the ac voltage signal of consequent electromotive force.And transducer 5-1~5-n carries out calculation process to the ac voltage signal from detecting device 4-1~4-n output respectively, thereby calculates the flow of the fluid of the ascending pipe 2-1~2-n that flows through.Expression outputs to control part 8-1~8-n respectively by the flow signal of the flow that transducer 5-1~5-n calculates.
Each control part 8-1~8-n opens and closes signal to the valve 3-1 that is arranged at each ascending pipe 2-1~2-n~3-n output respectively.After each control part 8-1~8-n output is opened signal and is opened each valve 3-1~3-n; Flow signal according to from the transducer 5-1 of each electromagnetic flowmeter 6-1~6-n~5-n output calculates the injection rate IR of the fluid that is injected into each container 1-1~1-n respectively, closes each valve 3-1~3-n respectively thereby close signal in the time point output that this injection rate IR has reached setting value.The above-mentioned setting value that the benchmark of signal is closed in output as each control part 8-1~8-n is individually adjusted before the filling machine running by each control part 8-1~8-n, even so that temperature and humidity etc. change also can be with a certain amount of fluid filled in all container 1-1~1-n.
Then, the electromagnetic flowmeter that uses in the system shown in Figure 1 is further explained.All electromagnetic flowmeter 6-1~6-n are identical formations in Fig. 1.Fig. 2 is expression by detecting device 4 (4-1~4-n) and the transducer 5 (electromagnetic flowmeter 6 of 5-1~5-n) constitute (block diagram of the major part in the 6-1~6-n).
In electromagnetic flowmeter 6, detecting device 4 is made up of field coil 4a, 4b, electrode 4c, 4d, ground loop 4e.Field coil 4a, 4b are produced a pair of coil of alternating magnetic field from the exciting current IR excitation of transducer 5, be configured in the periphery of ascending pipe 2 with the mode of the interior flow direction quadrature of the magnetic direction that produces and ascending pipe 2.
The leading section of electrode 4c, 4d is installed in the direction with the ascending pipe 2 interior magnetic field orthotropics that distribute towards the inwall of ascending pipe 2.Ground loop 4e is used to improve the input precision of electrode 4c, 4d, is electrically connected with reference potential.
Transducer 5 receives supervision portion 60, change-over switch SW1~SW4, input by clock signal generation portion 51, synchronizing signal generation portion 52, excitation division 53, controlling of sampling portion 54, enlarging section 55, sampling maintaining part 56, A/D transducer 57, arithmetic processing section 58, efferent 59, synchronizing signal and constitutes from the input terminal P1 of the signal of outside (below be called synchronizing signal receiving end P1) and to the lead-out terminal P2 of external output signal (below be called synchronizing signal transmitting terminal P2).
51 outputs of clock signal generation portion become the clock signal Pc of the action benchmark of transducer 5.Clock signal takes place the clock signal Pc frequency division of portion's 51 outputs to generate the synchronizing signal Ps of assigned frequency in synchronizing signal generation portion 52.
Excitation division 53 will be applied to field coil 4a, the 4b of detecting device 4 as field voltage VR by the assigned frequency that square wave constitutes, thereby to field coil 4a, 4b exciting current IR will be provided.This excitation division 53 and the polarity (excitation time) of coming switched energization voltage VR via the synchronized that change-over switch SW2 provides.About the synchronizing signal that provides via change-over switch SW2 with after state.
Controlling of sampling portion 54 is the basis with the synchronizing signal that provides via change-over switch SW1, generates change-over switch 56a, the sampled signal SP1 of 56b, the SP2 of closed respectively sampling maintaining part 56.The frequency of sampled signal SP1, SP2 all be synchronizing signal Ps frequency 1/2, the phase place of sampled signal SP1, the SP2 half period that staggers each other.About the synchronizing signal that provides via change-over switch SW1 with after state.
Enlarging section 55 is by amplifier 55a, the 55b of the ac voltage signal of the electrode 4c that exchange to amplify comes self-detector 4 respectively, 4d; And synthesize by the ac voltage signal of each amplifier 55a, 55b amplification and as the amplifier 55c formation that exchanges flow velocity signal S1 output.
Sampling maintaining part 56 is made up of first sampling hold circuit, second sampling hold circuit and differential amplifier 56g; Above-mentioned first sampling hold circuit is made up of change-over switch 56a, resistance 56c and electric capacity 56e, and above-mentioned second sampling hold circuit is made up of change-over switch 56b, resistance 56d and electric capacity 56f.The sampling maintaining part 56 that constitutes is like this sampled to exchanging flow velocity signal S1, and is exported as direct current flow velocity signal S2 according to sampled signal SP1, the SP2 from 54 outputs of controlling of sampling portion.
A/D transducer 57 will be transformed to digital signal from the direct current flow velocity signal S2 of sampling maintaining part 56 outputs.Arithmetic processing section 58 is through the average discharge to the fluid in the ascending pipe 2 that carries out calculation process from the digital signal of A/D transducer 57 output, calculate flowing through.Efferent 59 will output to control part 8 (Fig. 1) from the digital signal of the expression average discharge of arithmetic processing section 58 output.
Synchronizing signal receives the master sync signal that the next autonomous electromagnetic flowmeter that is directly or indirectly sent via change-over switch SW4 by synchronizing signal receiving end P1 is kept watch on by supervision portion 60, based on whether receiving the connection mode that this master sync signal comes control its switch SW1~SW3.About via the master sync signal of change-over switch SW4 with after state.
In addition, synchronizing signal receives supervision portion 60 passes through the master sync signal of the next autonomous electromagnetic flowmeter that receives through input end 60a, is exported by output terminal 60b.This synchronizing signal receives supervision portion 60 corresponding to synchronizing signal monitor unit of the present invention.
Change-over switch SW1~SW4 has pattern M and Mode S as connection mode, and the terminal M of public terminal C and master in pattern M (below be called the master terminal) is connected, and the terminal S of public terminal C and subordinate side in Mode S (below be called the subordinate side terminal) is connected.
As far as change-over switch SW1; Public terminal C is connected with input end 54a to controlling of sampling portion 54 input sync signals; Master terminal M is connected with the output terminal 52a that exports synchronizing signals from synchronizing signal generation portion 52, and subordinate side terminal S is connected with the subordinate side terminal S of change-over switch SW3.
As far as change-over switch SW2; Public terminal C is connected with input end 53a to excitation division 53 input sync signals; Master terminal M is connected with the output terminal 52a that exports synchronizing signals from synchronizing signal generation portion 52, and subordinate side terminal S is connected with the output terminal 60b that receives supervision portion 60 output master sync signals from synchronizing signal.
As far as change-over switch SW3, public terminal C is connected with synchronizing signal transmitting terminal P2, and master terminal M is connected with the output terminal 52a that exports synchronizing signals from synchronizing signal generation portion 52, and subordinate side terminal S is connected with the subordinate side terminal S of change-over switch SW1, SW2.
As far as change-over switch SW4, public terminal C is connected with synchronizing signal receiving end P1, and subordinate side terminal S is connected with the input end 60a that receives supervision portion 60 input master sync signals to synchronizing signal.The master terminal M of change-over switch SW4 is in open state.
The function of synchronizing signal generation portion 52, controlling of sampling portion 54, arithmetic processing section 58, synchronizing signal reception supervision portion 60 and change-over switch SW1~SW4 is implemented as the processing capacity of CPU in above formation.In addition, these functions can be not yet processing capacity through CPU realize that the hardware such as utilizing circuit that also can replace constitutes to be realized.
(embodiment 1: unidirectional series system)
Fig. 3 representes the unidirectional series system as an example of the connected mode of passing through synchronous signal line 7 between the electromagnetic flowmeter 6.In addition; In this example; For the ease of explanation to electromagnetic flowmeter 6 being set at such three of electromagnetic flowmeter 6-1,6-2,6-3, and with electromagnetic flowmeter 6-1 as main electromagnetic flowmeter, electromagnetic flowmeter 6-2,6-3 are described as the situation of subordinate electromagnetic flowmeter.And, in Fig. 3, only roughly represented the part of needs explanation in the formation of electromagnetic flowmeter 6-1,6-2,6-3.
In this unidirectional series system (embodiment 1), it is pattern M that main electromagnetic flowmeter 6-1 makes its change-over switch SW1~SW4, and it is Mode S that subordinate electromagnetic flowmeter 6-2,6-3 make its change-over switch SW1~SW4.
And; Be connected through synchronous signal line 7-1 between the synchronizing signal receiving end P1 with the synchronizing signal transmitting terminal P2 of main electromagnetic flowmeter 6-1 and subordinate electromagnetic flowmeter 6-2, be connected through synchronous signal line 7-2 between the synchronizing signal receiving end P1 with the synchronizing signal transmitting terminal P2 of subordinate electromagnetic flowmeter 6-2 and subordinate electromagnetic flowmeter 6-3.
In addition, in this example, the initial setting when dispatching from the factory, the change-over switch SW1 of electromagnetic flowmeter 6-1,6-2,6-3~SW4 is set at Mode S.Therefore, in the connection example shown in Figure 3, only to carry out the switching of the connection mode of change-over switch SW1~SW4 as the electromagnetic flowmeter 6-1 of main electromagnetic flowmeter.
For example, as the changing method of the connection mode of the change-over switch SW1 in the electromagnetic flowmeter 6~SW4, can consider following mode.Master/slave function of dominant SS is set in each electromagnetic flowmeter 6.Desire with the situation of electromagnetic flowmeter 6-1 as main electromagnetic flowmeter under, manual operation is arranged at the master/slave function of dominant SS among the electromagnetic flowmeter 6-1, and with the unified pattern M that is set at of the change-over switch SW1 in the electromagnetic flowmeter 6-1~SW4.Desire with electromagnetic flowmeter 6-2, the situation of 6-3 as the subordinate electromagnetic flowmeter under; Manual operation is arranged at the master/slave function of dominant SS among electromagnetic flowmeter 6-2, the 6-3, thereby with the unified Mode S that is set at of the change-over switch SW1 in electromagnetic flowmeter 6-2, the 6-3~SW4.
(just often)
Fig. 4 is the sequential chart of signal of each one of the main electromagnetic flowmeter 6-1 of expression; Fig. 4 (a) is the clock signal Pc from 51 outputs of clock signal generation portion; Fig. 4 (b) is the synchronizing signal Ps from 52 outputs of synchronizing signal generation portion; Fig. 4 (c) is the field voltage VR from excitation division 53 outputs; Fig. 4 (d) is the interchange flow velocity signal S1 of 55 outputs from the enlarging section, and Fig. 4 (e), (f) are respectively sampled signal SP1, the SP2 from 54 outputs of controlling of sampling portion, and Fig. 4 (g) is the direct current flow velocity signal S2 from 56 outputs of sampling maintaining part.
Fig. 5 is separately the sequential chart of phase relation of field voltage VR among expression main electromagnetic flowmeter 6-1 and subordinate electromagnetic flowmeter 6-2, the 6-3; Fig. 5 (a) is the field voltage VR among the main electromagnetic flowmeter 6-1; Fig. 5 (b) is the field voltage VR among the subordinate electromagnetic flowmeter 6-2, and Fig. 5 (c) is the field voltage VR among the subordinate electromagnetic flowmeter 6-3.
Main electromagnetic flowmeter 6-1 carries out frequency division to the clock signal Pc of for example 8MHz such shown in Fig. 4 (a) in its synchronizing signal generation portion 52, generate the synchronizing signal Ps of for example 170Hz such shown in Fig. 4 (b).The synchronizing signal Ps that is generated by this synchronizing signal generation portion 52 is applied to excitation division 53 via the change-over switch SW2 that is in the M pattern.And, be applied to controlling of sampling portion 54 via the change-over switch SW1 that is in the M pattern.
From the excitation division 53 output field voltage VR that for example such square wave by amplitude 20V forms shown in Fig. 4 (c).Because polarity and the synchronizing signal Ps of this field voltage VR are synchronously switched, so the frequency of field voltage VR becomes 85Hz.Therefore, produce the alternating magnetic field of 85Hz by field coil 4a, 4b (Fig. 2).
If the fluids in the ascending pipe 2 apply magnetic field, then through electromagnetic induction with the direction of the flow direction two direction quadratures of magnetic direction and fluid on, produce the electromotive force that has with the proportional amplitude of mean flow rate.Ac voltage signal based on this electromotive force is removed through pair of electrodes 4c, 4d, after being amplified by enlarging section 55 interchanges, as exchanging flow velocity signal S1 to 56 outputs of sampling maintaining part.
On the other hand, the synchronizing signal Ps that is generated by the synchronizing signal generation portion of main electromagnetic flowmeter 6-1 52 delivers to synchronizing signal transmitting terminal P2 via the change-over switch SW3 that is in the M pattern, and is exported as master sync signal MPs., received supervision portion 60 via the change-over switch SW4 that is in the S pattern by the synchronizing signal of subordinate electromagnetic flowmeter 6-2 and receive via the synchronizing signal receiving end P1 that synchronous signal line 7-1 is sent to subordinate electromagnetic flowmeter 6-2 from the master sync signal MPs of this main electromagnetic flowmeter 6-1 output.
The synchronizing signal of subordinate electromagnetic flowmeter 6-2 receives supervision portion 60 passes through the master sync signal MPs of the next autonomous electromagnetic flowmeter 6-1 that receives, and delivers to the subordinate side terminal S of change-over switch SW1, SW2, SW3.The master sync signal MPs that is sent to the subordinate side terminal S of change-over switch SW1 is applied to controlling of sampling portion 54.The master sync signal MPs that delivers to the subordinate side terminal S of change-over switch SW2 is applied to excitation division 53.
On the other hand, the master sync signal MPs of subordinate side terminal S that is sent to the change-over switch SW3 of subordinate electromagnetic flowmeter 6-2 is synchronized signal sending end P2 output.Master sync signal MPs by this subordinate electromagnetic flowmeter 6-2 output is sent to the synchronizing signal receiving end P1 of subordinate electromagnetic flowmeter 6-3 via synchronous signal line 7-2, and is received supervision portion 60 via change-over switch SW4 by the synchronizing signal of subordinate electromagnetic flowmeter 6-3 and receive.
The synchronizing signal of subordinate electromagnetic flowmeter 6-3 receives supervision portion 60 passes through the master sync signal MPs from subordinate electromagnetic flowmeter 6-2 that receives; Promptly, let the master sync signal MPs of the next autonomous electromagnetic flowmeter 6-1 that sends here via subordinate electromagnetic flowmeter 6-2 pass through, and deliver to the subordinate side terminal S of change-over switch SW1, SW2, SW3.The master sync signal MPs that is sent to the subordinate side terminal S of change-over switch SW1 is applied to controlling of sampling portion 54.The master sync signal MPs that is sent to the subordinate side terminal S of change-over switch SW2 is applied to excitation division 53.
In addition, the master sync signal MPs that is sent to the subordinate side terminal S of change-over switch SW3 transmits to synchronizing signal transmitting terminal P2, but synchronizing signal transmitting terminal P2 does not connect synchronous signal line 7, therefore becomes the last point of arrival here.Thus, main electromagnetic flowmeter 6-1 is as the master, and subordinate electromagnetic flowmeter 6-2 is as middle subordinate, and subordinate electromagnetic flowmeter 6-3 begins along the end of transmission (EOT) of unidirectional master sync signal MPs from main electromagnetic flowmeter 6-1 as the terminal subordinate.
In this embodiment 1, come the master sync signal MPs of autonomous electromagnetic flowmeter 6-1 to be sent to subordinate electromagnetic flowmeter 6-2,6-3 like this, excitation division 53 and the master sync signal MPs of electromagnetic flowmeter 6-1,6-2,6-3 synchronously move.Therefore, the phase place of the field voltage VR that exports respectively by the excitation division 53 of electromagnetic flowmeter 6-1,6-2,6-3, promptly the excitation time among electromagnetic flowmeter 6-1,6-2, the 6-3 is like Fig. 5 (a) and (b) and in full accord (c).
Incremental noise produces when the polarity of field voltage VR is switched.Therefore, in present embodiment 1, the incremental noise that is caused by the field voltage VR among electromagnetic flowmeter 6-1,6-2, the 6-3 produces simultaneously.Therefore; For example; Even in electromagnetic flowmeter 6-1, with overlapping based on the ac voltage signal of electromotive force, the spiking that in exchanging flow velocity signal S1, occurs also only appears at the beginning part of each pulse shown in Fig. 4 (d) from the incremental noise of approaching electromagnetic flowmeter 6-2,6-3.Therefore, through being set in like Fig. 4 (e) between the sampling period that will exchange flow velocity signal S1 and the latter end of each pulse (f), thereby can prevent in electromagnetic flowmeter 6-1, to sample spiking.Identical therewith, in electromagnetic flowmeter 6-2,6-3, also can prevent to sample spiking.
(unusual time)
In this embodiment 1, for example, when occurring in the communication abnormalities such as the last noise on noise of synchronous signal line 7-1 between main electromagnetic flowmeter 6-1 and the subordinate electromagnetic flowmeter 6-2 (with reference to Fig. 6).At this moment, be cut off to the transmission of the master sync signal MPs of subordinate electromagnetic flowmeter 6-2 from main electromagnetic flowmeter 6-1.
In subordinate electromagnetic flowmeter 6-2; Synchronizing signal receives the master sync signal MPs that autonomous electromagnetic flowmeter 6-1 keeps watch in supervision portion 60; If do not receive the master sync signal MPs of autonomous electromagnetic flowmeter 6-1, then the connection mode with change-over switch SW1~SW3 switches to pattern M from Mode S.
Thus, in subordinate electromagnetic flowmeter 6-2, the synchronizing signal Ps that is generated by oneself synchronizing signal generation portion 52 sends to controlling of sampling portion 54 via the change-over switch SW1 that is in pattern M.And the synchronizing signal Ps that is generated by oneself synchronizing signal generation portion 52 sends to excitation division 53 via the change-over switch SW2 that is in pattern M.And the synchronizing signal Ps that is generated by the synchronizing signal generation portion of subordinate electromagnetic flowmeter 6-2 52 sends to synchronizing signal transmitting terminal P2 via the change-over switch SW3 that is in pattern M, exports as master sync signal Mps '.
Based on this; The synchronizing signal Ps that subordinate electromagnetic flowmeter 6-2 uses the synchronizing signal generation portion 52 of oneself to generate carries out flow measurement; And the synchronizing signal Ps that oneself synchronizing signal generation portion 52 is generated is as the master sync signal MPs ' output that comes autonomous electromagnetic flowmeter, the back subordinate electromagnetic flowmeter 6-3 of one-level played the effect of main electromagnetic flowmeter.Promptly, electromagnetic flowmeter 6-2 switched to the master from so far middle subordinate, becomes the second main electromagnetic flowmeter.
Master sync signal MPs ' from subordinate electromagnetic flowmeter 6-2 output is sent to the synchronizing signal receiving end P1 of subordinate electromagnetic flowmeter 6-3 via synchronous signal line 7-2, and is received supervision portion 60 via the change-over switch SW4 that is in the S pattern by the synchronizing signal of subordinate electromagnetic flowmeter 6-3 and receive.
The synchronizing signal of subordinate electromagnetic flowmeter 6-3 receives supervision portion 60 passes through the master sync signal MPs ' from subordinate electromagnetic flowmeter 6-2 that receives; Promptly, the master sync signal MPs ' from the second main electromagnetic flowmeter 6-2 is passed through, and be sent to the subordinate side terminal S of change-over switch SW1, SW2, SW3.
The master sync signal MPs ' that is sent to the subordinate side terminal S of change-over switch SW1 is applied to controlling of sampling portion 54.The master sync signal MPs ' that is sent to the subordinate side terminal S of change-over switch SW2 is applied to excitation division 53.The master sync signal MPs ' that is sent to the subordinate side terminal S of change-over switch SW3 arrives synchronizing signal transmitting terminal P2.
Like this, the synchronous signal line 7-1 between main electromagnetic flowmeter 6-1 and the subordinate electromagnetic flowmeter 6-2 has produced under the situation of exceptional communication, and the synchronizing signal Ps that subordinate electromagnetic flowmeter 6-2 uses the synchronizing signal generation portion 53 of oneself to generate proceeds flow measurement.And the synchronizing signal Ps that oneself synchronizing signal generation portion 53 is generated proceeds the flow measurement of subordinate electromagnetic flowmeter 6-3 as the master sync signal MPs ' that the comes autonomous electromagnetic flowmeter subordinate electromagnetic flowmeter 6-3 transmission of one-level backward.
(recovering automatically)
In Fig. 6,, then begun once more to the transmission of the master sync signal MPs of subordinate electromagnetic flowmeter 6-2 from main electromagnetic flowmeter 6-1 if the exceptional communication among the synchronous signal line 7-1 between main electromagnetic flowmeter 6-1 and the subordinate electromagnetic flowmeter 6-2 is recovered.
In subordinate electromagnetic flowmeter 6-2; Synchronizing signal receives the master sync signal MPs that autonomous electromagnetic flowmeter 6-1 keeps watch in supervision portion 60; If come the reception of the master sync signal MPs of autonomous electromagnetic flowmeter 6-1 to be begun once more, then the connection mode with change-over switch SW1~SW3 switches to Mode S (with reference to Fig. 7) from pattern M.
Thus, in subordinate electromagnetic flowmeter 6-2, switch to the master sync signal MPs of autonomous electromagnetic flowmeter 6-1 to the synchronizing signal of excitation division 53 transmissions.And the synchronizing signal of sending to controlling of sampling portion 54 switches to the master sync signal MPs of autonomous electromagnetic flowmeter 6-1.And the synchronizing signal of exporting from synchronizing signal transmitting terminal P2 switches to the master sync signal MPs of autonomous electromagnetic flowmeter 6-1.
Like this; If the exceptional communication among the synchronous signal line 7-1 between main electromagnetic flowmeter 6-1 and the subordinate electromagnetic flowmeter 6-2 is recovered; Then subordinate electromagnetic flowmeter 6-2 automatically turns back to original middle subordinate, has used the flow processing of the master sync signal MPs that comes autonomous electromagnetic flowmeter 6-1 to be begun once more.And master sync signal MPs is begun to the output of subordinate electromagnetic flowmeter 6-3 from main electromagnetic flowmeter 6-1 once more.
In addition; In this example; Situation to exceptional communication takes place on the synchronous signal line 7-1 between main electromagnetic flowmeter 6-1 and the subordinate electromagnetic flowmeter 6-2 is illustrated; But break down at main electromagnetic flowmeter 6-1, or the synchronous signal line 7-1 between main electromagnetic flowmeter 6-1 and the subordinate electromagnetic flowmeter 6-2 breaks, or under the receiving circuit of the synchronizing signal of subordinate electromagnetic flowmeter 6-1 (synchronizing signal receives the previous stage circuit of the supervision portion 60) situation about breaking down; Also move identically, make subordinate electromagnetic flowmeter 6-2,6-3 proceed flow measurement with above-mentioned.
And, in this example, the situation that three electromagnetic flowmeters 6 are set is illustrated, but reality can be provided with more electromagnetic flowmeter 6.Fig. 8 (a) schematically representes the connection example under this situation.In this example, electromagnetic flowmeter 6-1 is as main electromagnetic flowmeter, and this main electromagnetic flowmeter 6-1 is connected in series through signal wire 7-1~7-5 and subordinate electromagnetic flowmeter 6-2~6-6.
In such connection example; For example; Taken place at the synchronous signal line 7-3 between subordinate electromagnetic flowmeter 6-3 and the 6-4 under the situation of exceptional communication (Fig. 8 (b)); The pattern of subordinate electromagnetic flowmeter 6-4 becomes the holotype of using the own synchronizing signal that generates to carry out flow measurement, and to the subordinate electromagnetic flowmeter 6-5 of back one-level, the effect that 6-6 plays main electromagnetic flowmeter.
Then; If the exceptional communication among the synchronous signal line 7-3 between subordinate electromagnetic flowmeter 6-3 and the 6-4 is recovered (Fig. 8 (c)); Then the pattern of subordinate electromagnetic flowmeter 6-4 turns back to the subordinate pattern that master sync signal that the electromagnetic flowmeter that uses previous stage sends carries out flow measurement, finishes the subordinate electromagnetic flowmeter 6-5 of back one-level, the effect that 6-6 plays main electromagnetic flowmeter.
Connection example according to Fig. 8 just can be understood; Be provided with under the situation of a plurality of electromagnetic flowmeters; If certain part between the subordinate electromagnetic flowmeter of main electromagnetic flowmeter and end the then several subordinate electromagnetic flowmeters of communication abnormality takes place can automatically change to main electromagnetic flowmeter, many main electromagnetic flowmeters have been produced simultaneously.If then may cause magnetic interference to its such placement.
But; In this embodiment; Under the situation of having removed communication abnormality; The pattern that is in the subordinate electromagnetic flowmeter of holotype automatically turns back to original subordinate pattern, therefore can not let alone the state that has produced many main electromagnetic flowmeters simultaneously, can promptly eliminate the possibility that causes magnetic interference.
(embodiment 2: tree-shaped mode)
In above-mentioned embodiment 1, making 6 connected modes through synchronous signal line 7 of electromagnetic flowmeter is unidirectional series system, but 6 connected modes through synchronous signal line 7 of electromagnetic flowmeter are not limited to unidirectional series system.For example, also through synchronous signal line 7 with being connected to tree-shaped tree-shaped mode between the electromagnetic flowmeter 6.
Fig. 9 (a) has schematically represented the connection example of this situation.In Fig. 9 (a); Electromagnetic flowmeter 6-1 is as main electromagnetic flowmeter; This main electromagnetic flowmeter 6-1 is connected with subordinate electromagnetic flowmeter 6-1,6-3 through synchronous signal line 7-1,7-2; Subordinate electromagnetic flowmeter 6-2 is connected with subordinate electromagnetic flowmeter 6-4,6-5 through synchronous signal line 7-3,7-4, and subordinate electromagnetic flowmeter 6-3 is connected with subordinate electromagnetic flowmeter 6-6,6-7 through synchronous signal line 7-5,7-6.Figure 10 roughly representes the concrete connection state between the electromagnetic flowmeter 6 in this connection example.
In such connection example; For example; Under the situation that exceptional communication has taken place on synchronous signal line 7-1 between subordinate electromagnetic flowmeter 6-2 and the 6-3 and the 7-2 (Fig. 9 (b)); The pattern of subordinate electromagnetic flowmeter 6-2 and 6-3 becomes holotype, to subordinate electromagnetic flowmeter 6-4,6-5 and the 6-6 of back one-level, the effect that 6-7 has played main electromagnetic flowmeter.And for example, if the communication abnormality among the synchronous signal line 7-1 between electromagnetic flowmeter 6-1 and the 6-2 recovers (Fig. 9 (c)), then the pattern of subordinate electromagnetic flowmeter 6-2 automatically reverts to the subordinate pattern.
In addition, in described embodiment 1,2, constituted all electromagnetic flowmeters 6 identically, but also needn't constitute all electromagnetic flowmeters 6 identically.For example; In formation shown in Figure 3; Also can adopt and from main electromagnetic flowmeter 6-1, remove the formation that synchronizing signal receiving end P1 and synchronizing signal receive supervision portion 60, switch SW 1~SW4, or adopt the formation of from the subordinate electromagnetic flowmeter 6-3 that becomes terminal subordinate, removing synchronizing signal transmitting terminal P2 and switch SW 3.
As constitute all electromagnetic flowmeters 6 identically, then can the electromagnetic flowmeter that use be set at a kind of type.And which electromagnetic flowmeter can both can also increase main electromagnetic flowmeter as required as main electromagnetic flowmeter.And, even a main electromagnetic flowmeter breaks down,, the fluid filled operation of container is proceeded and can make through the main electromagnetic flowmeter that is set at that from other electromagnetic flowmeter, replaces.
And; In above-mentioned embodiment 1,2; To through in each electromagnetic flowmeter 6, being provided with master/slave function of dominant SS etc.; Manually carry out the situation that the selection that electromagnetic flowmeter plays a role as main electromagnetic flowmeter or plays a role as the subordinate electromagnetic flowmeter is set is illustrated, but also can automatically carry out playing a role or setting through the judgement of electromagnetic flowmeter 6 self as the selection that the subordinate electromagnetic flowmeter plays a role as main electromagnetic flowmeter.
For example, after system connected, if certain hour, do not receive from upper synchronizing signal; Then change-over switch SW1~SW4 is set at pattern M; Play a role as main electromagnetic flowmeter, keep watch on certain hour, if receive synchronizing signal; Then change-over switch SW1~SW4 is set at Mode S, plays a role as the subordinate electromagnetic flowmeter.Like this, after system connected, if through certain hour, then main electromagnetic flowmeter automatically became one, and other all become the subordinate electromagnetic flowmeter.
And; In above-mentioned embodiment 1,2; The pattern that each electromagnetic flowmeter 6 will use the synchronizing signal that oneself generates to carry out flow measurement is defined as holotype; The pattern that the master sync signal that use is sent from previous stage carries out flow measurement is defined as the subordinate pattern and moves, but also can be provided with current be the function which pattern is notified to epigyny device.
For example; Receive the connection mode of the supervision 60 monitoring switch SW1 of portion, SW2, SW3 by synchronizing signal; If being the words of pattern M, the connection mode of switch SW 1, SW2, SW3 is judged as holotype; If the words of Mode S then are judged as the subordinate pattern, through efferent 59 this pattern of having judged is sent to control part 8, send to upper monitoring arrangement (not shown) from control part 8.
Based on this; In upper monitoring arrangement; For example, the number of the main electromagnetic flowmeter 6 that the number and the initial setting of the current electromagnetic flowmeter 6 that is in holotype are confirmed compares, if be in the words that the number of the number of current electromagnetic flowmeter 6 of the holotype main electromagnetic flowmeter 6 more definite than initial setting is Duoed; Then can discern communication abnormality has taken place, it carried out respective action.
And; In above-mentioned embodiment 1,2; Also can receive in the supervision portion 60 master sync signal of keeping watch on autonomous electromagnetic flowmeter is set,, notify the function of this meaning to epigyny device not receiving under the situation of master sync signal in the synchronizing signal of each electromagnetic flowmeter 6.For example, send the meaning that does not receive master sync signal to control part 8, send to upper monitoring arrangement (not shown) by control part 8 through efferent 59.
Thus, in upper monitoring arrangement, for example, can grasp which subordinate electromagnetic flowmeter and fail to receive master sync signal, can dwindle unusual transmission position, can promptly carry out the abnormal restoring operation.
In addition, though be that main electromagnetic flowmeter receives under the situation of synchronizing signal, it is unusual also to be considered to notice.And, can consider the output signal of stop pulse output etc. or make its maximum or before unusual, keep various methods such as this output signal or this output signal of ignorance from the abnormity notifying method of electromagnetic flowmeter.And, also can select such advice method by the client through application program.And, also can notify the user through flicker, the display action of displays such as LED, LCD.And, also can be unusual through the notice of the communication function on the line.
And; In above-mentioned embodiment 1,2, be illustrated as the suitable example of filling machine, but be not limited to being suitable for filling machine; Can be applicable to and have a plurality of electromagnetic flowmeters; Wherein certain is as main electromagnetic flowmeter, remaining as the subordinate electromagnetic flowmeter, carry out the various systems of excitation with the synchronized ground that comes autonomous electromagnetic flowmeter.
And in such system, the platform number of the main electromagnetic flowmeter of initial setting may not be defined as one, preferably sets lessly.

Claims (6)

1. Flow Measuring System; It possesses a plurality of electromagnetic flowmeters, and above-mentioned a plurality of electromagnetic flowmeters have the synchronizing signal generation unit of the synchronizing signal that generates assigned frequency, with in said a plurality of electromagnetic flowmeters any as main electromagnetic flowmeter; With other electromagnetic flowmeter as the subordinate electromagnetic flowmeter; The synchronizing signal that in said main electromagnetic flowmeter, oneself synchronizing signal generation unit is generated as master sync signal and with the synchronous excitation time of this master sync signal in, produce magnetic field and carry out flow measurement, said subordinate electromagnetic flowmeter; With the synchronous excitation time of the master sync signal that sends directly or indirectly from said main electromagnetic flowmeter in; Produce magnetic field and carry out flow measurement, it is characterized in that
Said subordinate electromagnetic flowmeter possesses the synchronizing signal monitor unit; This synchronizing signal monitoring unit monitors is from the master sync signal of said main electromagnetic flowmeter; Under the situation of the master sync signal that does not receive autonomous electromagnetic flowmeter; The synchronizing signal that will be used for flow measurement switches to the synchronizing signal of the synchronizing signal generation unit generation of oneself, and the conduct of the synchronizing signal after will switching is to the master sync signal of the subordinate electromagnetic flowmeter transmission of next stage.
2. Flow Measuring System according to claim 1 is characterized in that,
Said each electromagnetic flowmeter possesses the selection setup unit, and this selection setup unit is used to make it to play a role as said main electromagnetic flowmeter or plays a role as said subordinate electromagnetic flowmeter.
3. Flow Measuring System according to claim 1 is characterized in that,
Said synchronizing signal monitor unit; Supervision is from the master sync signal of said main electromagnetic flowmeter; Under the situation of the master sync signal that receives autonomous electromagnetic flowmeter once more; The synchronizing signal that will be used for flow measurement switches to the master sync signal that this receives once more, and the conduct of the master sync signal after will switching is to the master sync signal of the subordinate electromagnetic flowmeter transmission of next stage.
4. Flow Measuring System according to claim 1 is characterized in that,
Said each electromagnetic flowmeter possesses current pattern notification unit; The pattern that the synchronizing signal that this current pattern notification unit will use the synchronizing signal generation unit of oneself to generate is carried out flow measurement is defined as holotype; The pattern of using the master sync signal that sends from the electromagnetic flowmeter of previous stage to carry out flow measurement is defined as the subordinate pattern, and with current be that which pattern is notified to epigyny device.
5. Flow Measuring System according to claim 1 is characterized in that,
Said synchronizing signal monitor unit is kept watch on the master sync signal from said main electromagnetic flowmeter, under the situation of the master sync signal that does not receive autonomous electromagnetic flowmeter, gives epigyny device with the intention notice that does not receive master sync signal.
6. Flow Measuring System, it possesses:
A plurality of ascending pipes, they closely are configured to inject fluid respectively to a plurality of containers each other;
Valve, it is arranged at said each ascending pipe each, and respectively said each ascending pipe is opened and closed according to opening signal and closing signal;
Electromagnetic flowmeter; It is arranged at said each ascending pipe each; The synchronizing signal generation unit of synchronizing signal with frequency of the regulation of generating is according to measuring flow and delivery rate signal through the fluid in said each ascending pipe being applied the electromotive force that alternating magnetic field produces;
Control module, to the said signal of opening of said each valve output, the flow signal of after this opens signal output, exporting according to said each electromagnetic flowmeter is exported the above-mentioned signal that closes to said each valve respectively then to a certain amount of fluid of said each vessel filling respectively,
To be arranged in the electromagnetic flowmeter of each ascending pipe of said each ascending pipe any as main electromagnetic flowmeter; With other electromagnetic flowmeter as the subordinate electromagnetic flowmeter; The synchronizing signal that in said main electromagnetic flowmeter, oneself synchronizing signal generation unit is generated is carried out flow measurement as master sync signal and producing said magnetic field with the synchronous excitation time of this master sync signal; And in said subordinate electromagnetic flowmeter, carrying out flow measurement with the synchronous excitation time generation magnetic field of the master sync signal that sends directly or indirectly from said main electromagnetic flowmeter; It is characterized in that
Said subordinate electromagnetic flowmeter possesses the synchronizing signal monitor unit; This synchronizing signal monitor unit; Supervision is from the master sync signal of said main electromagnetic flowmeter; Under the situation that does not receive the master sync signal that comes autonomous electromagnetic flowmeter, the synchronizing signal that will be used for flow measurement switches to the synchronizing signal that own synchronizing signal generation unit generates, and the conduct of the synchronizing signal after will the switching master sync signal of the subordinate electromagnetic flowmeter transmission of one-level backward.
CN2009101745311A 2008-09-30 2009-09-28 Flow rate measuring system Expired - Fee Related CN101713674B (en)

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